Lastgenre overwriting existing tags

Hi,

I’m trying lastgenre plugin with following settings:
lastgenre:
count: 3
separator: ‘;’
prefer_specific: yes
force: no
fallback: ‘Unknown’

The description says that "To instead leave genres in place in when they pass the whitelist, set the force option to no". So I guess existing tags should be kept.

First album I’m trying to import is this one: https://www.last.fm/music/'77/21st+Century+Rock

Tags before import:

Metadata:
title : Gimme Rock ‘n’ Roll
artist : '77
track : 01/10
album : 21st Century Rock
disc : 1/1
date : 2009
genre : Hard Rock
TDOR : 2008
TMED : CD
album_artist : '77
publisher : Listenable Records
TSO2 : '77
artist-sort : '77
Artists : '77
CATALOGNUMBER : POSH134
MusicBrainz Album Artist Id: 00a85bac-50fb-44ea-8ff3-3cc849a075d9
MusicBrainz Album Id: 51d9fa30-279d-4e70-a53f-206c60681bfb
MusicBrainz Album Release Country: FR
MusicBrainz Album Status: official
MusicBrainz Album Type: album
MusicBrainz Artist Id: 00a85bac-50fb-44ea-8ff3-3cc849a075d9
MusicBrainz Release Group Id: 51152fbb-bf1f-4f6b-a99d-540274eb0adc
MusicBrainz Release Track Id: afeedbda-4193-37f2-936f-181858243f73
SCRIPT : Latn
originalyear : 2008
REPLAYGAIN_TRACK_GAIN: -10.16 dB
REPLAYGAIN_TRACK_PEAK: 1.062064
REPLAYGAIN_ALBUM_GAIN: -9.62 dB
REPLAYGAIN_ALBUM_PEAK: 1.098673
REPLAYGAIN_REFERENCE_LOUDNESS: -18.00 LUFS
REPLAYGAIN_TRACK_RANGE: 3.19 dB
REPLAYGAIN_ALBUM_RANGE: 6.50 dB

Tags after import:

Metadata:
title : Gimme Rock ‘n’ Roll
artist : ’77
track : 1/10
album : 21st Century Rock
disc : 1/1
date : 2008
genre : Unknown
TBPM : 0
compilation : 0
TMED : CD
TSO2 : '77
TDOR : 2008
lyrics-XXX :
album_artist : ’77
artist-sort : ’77
TIPL : arranger
Artists : '77
SCRIPT : Latn
originalyear : 2008
publisher : Listenable Records
Artist Credit : ’77
ALBUMARTISTSORT : ’77
CATALOGNUMBER : POSH134
Album Artist Credit: ’77
MusicBrainz Album Type: album
REPLAYGAIN_ALBUM_GAIN: -9.62 dB
REPLAYGAIN_ALBUM_PEAK: 1.098673
REPLAYGAIN_ALBUM_RANGE: 6.50 dB
REPLAYGAIN_TRACK_PEAK: 1.062064
REPLAYGAIN_TRACK_RANGE: 3.19 dB
REPLAYGAIN_TRACK_GAIN: -10.16 dB
MusicBrainz Album Status: Official
MusicBrainz Album Release Country: FR
REPLAYGAIN_REFERENCE_LOUDNESS: -18.00 LUFS
Acoustid Id : fd5a1a61-452f-45c9-9ec3-89f596ca192b
MusicBrainz Album Id: 51d9fa30-279d-4e70-a53f-206c60681bfb
MusicBrainz Artist Id: 00a85bac-50fb-44ea-8ff3-3cc849a075d9
MusicBrainz Album Artist Id: 00a85bac-50fb-44ea-8ff3-3cc849a075d9
MusicBrainz Release Group Id: 51152fbb-bf1f-4f6b-a99d-540274eb0adc
MusicBrainz Release Track Id: afeedbda-4193-37f2-936f-181858243f73
iTunNORM : 00002887 00002887 00006552 00006552 00000000 00000000 000087F1 000087F1 00000000 00000000
Acoustid Fingerprint: AQADtJs0RWKkJLhe5Eim59gt7Mez4WN0nLBzEeGhF82PUPrxC2H2QfsRaQ3spkQ_JjiP9rmQTzTEUTp-hDd-CT4e6viFRrnRZzGeIeQL8YjUC9_x5jjaGz–B_nwRMcf5KoO78cfzCvaqBZ6_LD0ook0FnkPPTv6FM2wK0ef4IQY4gev4oLPo1ahFz-qFt_hw0XVCVeL7-iyLDmaStDz4bIRhkqJUltp_MFvuGI4PMmRH3q3w0d2JR8-Bf0RKVv

  1. Why is tag “Hard Rock” removed? It is in the default whitelist, isn’t it?
  2. Why is tag “Unknown” used? The Last.fm page lists tags for this album?